ArchViz Glass for quick renders in Cycles?
Note: This has nothing to do with physically based glass.


Andrew Price reccomends this 'Glass Hack shader' specifically for archviz renders, where caustics aren't that important. Relevant part of video here

Working principle
It doesn't affect Shadow, Diffuse and Glossy rays in any way, but your camera still sees a reflection when looking at it.

Pros: Very fast, low noise
Cons: No refraction